CO2-induced alterations in plant nitrate utilization and root exudation stimulate N2O emissions

doi:10.1111/nph.14585

	CO2-induced alterations in plant nitrate utilization and root exudation stimulate N2O emissions
	Wu, Keke 1,2; Chen, Dima 2,3; Tu, Cong 2; Qiu, Yunpeng 2; Burkey, Kent O.; Reberg-Horton, S. Chris ; Peng, Shaolin 1; Hu, Shuijin 2
	2017
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
卷号	106 页码:9-17
摘要	Atmospheric carbon dioxide enrichment (eCO(2)) often increases soil nitrbus oxide (N2O) emissions, which has been largely attributed to increased denitrification induced by CO2-enhancement of soil labile C and moisture. However, the origin of the N remains unexplained. Emerging evidence suggests that eCO2 alters plant N preference in favor of ammonium (NH4+-N) over nitrate (NO3--N). Yet, whether and how this attributes to the enhancement of N2O emissions has not been investigated. We conducted a microcosm experiment with wheat (Triticum aestivum L.) and tall fescue (Schedonorus arundinaceus (Schreb.) Dumort.) to examine the effects of eCO(2) on soil N2O emissions in the presence of two N forms (NH4+-N or NO3--N). Results obtained showed that N forms dominated eCO2 effects on plant and microbial N utilization, and thus soil N2O emissions. Elevated CO2 significantly increased the rate and the sum of N2O emissions by three to four folds when NO3--N, but not NH4+-N, was supplied under both wheat and tall fescue. While enhanced N2O emission was more related to the reduced plant NO3--N Uptake under wheat, it concurred with increased labile C under tall fescue. In the presence of NO3--N, significantly lower shoot biomass N and N-15, but higher plant biomass C:N ratio, mitrobial biomass C and N, and/or soil extractable C indicated that eCO(2) constrained plant NO3--N utilization and likely stimulated root exudation. We propose a new conceptual model in which eCO(2)-inhibition of plant NO3--N uptake and/or CO2-enhancement of soil labile C enhances the N and/or C availability for denitrifiers and increases the intensity and/or the duration of N2O emissions. Together, these findings indicate that CO2-enhancement of soil N and labile C favors denitrification, suggesting that management of N fertilizers in intensive systems will likely become more challenging under future CO2 scenarios. (C) 2016 Elsevier Ltd. All rights reserved.
关键词	Elevated CO2 Root exudation Nitrous oxide N-15 tracer Ammonium nitrogen (NH4+-N) Nitrate nitrogen (NO3--N) Fertilization management
学科领域	Plant Sciences
DOI	10.1111/nph.14585
收录类别	SCI
语种	英语
WOS关键词	ELEVATED ATMOSPHERIC CO2 ; NITROUS-OXIDE EMISSIONS ; CARBON-DIOXIDE ; FOREST PRODUCTIVITY ; GREENHOUSE GASES ; USE EFFICIENCY ; SOIL ; RESPONSES ; ASSIMILATION ; FLUXES
WOS记录号	WOS:000403710800021
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
资助机构	College of Agriculture and Life Sciences, NC State University ; NIFA, USDAUnited States Department of Agriculture (USDA) [USDA_2012-02978-230561] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [NSFC 31030015] ; Hongda Zhang Scientific Research Fund ; International Program of Project 985 at Sun Yatsen University
作者邮箱	kekewu121@163.com ; chendima@ibcas.ac.cn ; ctu2@ncsu.edu ; yqiu4@ncsu.edu ; KentBurkey@ars.usda.gov ; chris_reberg-horton@ncsu.edu ; lsspsl@mail.sysu.edu.cn ; shu4@ncsu.edu
作品OA属性	Bronze
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/22253
专题	植被与环境变化国家重点实验室
作者单位	1.Sun Yat Sen Univ, Key Lab Biocontrol, Sch Life Sci, Guangzhou 510275, Guangdong, Peoples R China 2.Sun Yat Sen Univ, Guangdong Prov Key Lab Plant Resources, Sch Life Sci, Guangzhou 510275, Guangdong, Peoples R China 3.North Carolina State Univ, Dept Plant Pathol, Raleigh, NC 27695 USA 4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 5.Burkey, Kent O.] USDA ARS, Plant Sci Res Unit, Raleigh, NC 27607 USA 6.North Carolina State Univ, Dept Crop Sci, Raleigh, NC 27695 USA
推荐引用方式 GB/T 7714	Wu, Keke,Chen, Dima,Tu, Cong,et al. CO2-induced alterations in plant nitrate utilization and root exudation stimulate N2O emissions[J]. SOIL BIOLOGY & BIOCHEMISTRY,2017,106:9-17.
APA	Wu, Keke.,Chen, Dima.,Tu, Cong.,Qiu, Yunpeng.,Burkey, Kent O..,...&Hu, Shuijin.(2017).CO2-induced alterations in plant nitrate utilization and root exudation stimulate N2O emissions.SOIL BIOLOGY & BIOCHEMISTRY,106,9-17.
MLA	Wu, Keke,et al."CO2-induced alterations in plant nitrate utilization and root exudation stimulate N2O emissions".SOIL BIOLOGY & BIOCHEMISTRY 106(2017):9-17.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Wang-2017-Arabidopsi（4895KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	浏览请求全文